Originally Posted by BillyBob58
How about testing with- if there is such a thing - a breathable sb? If it really was quite breathable, and if you still got a significant warmth boost, then I suppose that would mean that radiant block counts for something?
Regardless, interesting discussion!
I can't imagine that there is a breathable SB out there...although tyvek has been considred a "breathable vapor barrier".
And the only way I can imagine trying to actually test what works best would be to spend time in one setup, break down and reset for the other condition, and then spend the same time in the new setup...assuming the rest of the test conditions remain consistent throughout your test period.
I can't vouch for much other than again I used the HHSS, with SB, this past weekend in weather down around 30 deg and pretty humid out both nights. Inside the hammock I used my military ICW bag, and a fleece sleeping bag liner.
No moisture was obvious anywhere in the system either night/morning. The first night there was a ton of moisture buildup on both the inside and outside of my tarp (it was FOGGY!!!), but nothing inside my hammock or bags.
I stayed toasty warm both nights. Weasel was out with me in his HHSS, but I'm not sure what he used for top insulation.